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GLOBAL WINDS
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WHAT IS WIND?
• Wind is the movement of air caused by an uneven heating of the Earth’s
surface.
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WHAT HEATS EARTH’S SURFACE?
• Heat from the sun heats the
surface of the Earth.
• This heat arrives to Earth in the
form of radiation.
• Radiation is the transfer of energy
by electromagnetic waves.
• Radiation can transfer heat
without direct contact between
objects.
• Solar radiation originates from the
sun.
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(C) Copyright 2014 - all rights reserved www.cpalms.org
COLLABORATION TIME
TWO MINUTES
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• Winds do not travel straight
from the equator to poles.
• Due to the cycling of hot, low
pressure and less dense air
with cold, high pressure,
more dense air, wind travels
via convection cells.
Convection cells are:
• Pockets of cycling warm, less
dense, low pressure air with
cool, denser high-pressure air.
• Pressure difference results in
global movement of air.
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CONVECTION CELLS
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WHAT ARE GLOBAL WINDS?
• Global winds are winds that are produced by the movement of air between
the equator and the poles.
•
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(C) Copyright 2014 - all rights reserved www.cpalms.org
(C) Copyright 2014 - all rights reserved www.cpalms.org
COLLABORATION TIME
TWO MINUTES
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MAJOR GLOBAL WINDS
•Polar Easterlies
•Westerlies (prevailing)
•Trade winds
•Doldrums
•Horse Latitudes
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DOLDRUMS
• Little or low wind area near the equator where warm air rises.
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TRADE WINDS
• Winds that blow from the horse latitudes toward the equator.
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Image from :http://upload.wikimedia.org/wikipedia/commons/c/cd/AtmosphCirc2.png
(C) Copyright 2014 - all rights reserved www.cpalms.org
COLLABORATION TIME
TWO MINUTES
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HORSE LATITUDES
• Little or low wind area where air is falling.
• Found at 30 degrees latitude.
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WESTERLIES (PREVAILING)
• Winds that blow from the west to the east.
• Found between 30 and 60 degree latitudes.
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POLAR EASTERLIES
• Winds that blow away from the poles.
• Blows from east to west.
• Found between the poles and 60 degrees latitude.
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2014:http://upload.wikimedia.org/wikipedia/commons/c/cd/AtmosphCirc2.png
- all rights reserved www.cpalms.org
Image from
(C) Copyright 2014 - all rights reserved www.cpalms.org
COLLABORATION TIME
TWO MINUTES
Image from: https://c1.staticflickr.com/1/52/145149313_c9c75df6f8_z.jpg